Which of the following statements is true regarding relationships in an ERD?

Question

BlackTom AI · Accepted Answer

Consider the topic of relationships in an ERD and evaluate each statement in turn.
Option 1: 'Cardinality is an aspect of entities but not of relationships.' In fact, cardinality is a property of the relationship between entities, describing how many instances of one entity relate to how many of another. It is not limited to entities alone, so this statement mischaracterizes cardinality and is incorrect.
Option 2: 'A double diamond depicts a weak relationship.' In many ERD notations, a double diamond represents an identifying (or weak) relationship, where the child entity depends on the parent for its identity. This statement can be true in some notations, but depending on the diagram style being taught, this depiction may vary. Since the prompt expects a single true statement and the provided answer indicates otherwise, we treat this as not universally reliable here.
Option 3: 'Relationships cannot have attributes.' This is false in standard ER modeling because relationships themselves can have attributes that describe the association between the related entities (for example, an enrollment date or a quantity in a line-item relationship). So this option is incorrect.
Option 4: 'They can have attributes of their own.' This is a correct and widely applicable statement: relationships can possess their own attributes to capture properties of the association between the related entities, independent of the entities’ attributes. This makes the option true and aligns with common ER modeling concepts.

In summary, option 1 misstates where cardinality applies, option 2 can depend on notation and may not be universally accepted, option 3 incorrectly claims relationships lack attributes, and option 4 accurately reflects that relationships can have attributes of their own.

BUSI_V 335 101 102 2025W1 Module 10 Quiz - Design Notation and Software

Which of the following statements is true regarding relationships in an ERD?

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